Coal ash in the U.S. holds substantial rare earth elements, potentially reducing dependence on imports, with ongoing research ...

The Earth formed over 4.6 billion years ago out of a mixture of dust and gas ... asteroids and planetesimals left behind by the planet-building process. Radioactive elements like uranium and hafnium ...

The 12-star signs are split into 4 zodiac element groups; Fire, Earth, Air, and Water, and each group represents both a type ...